Mechanical-telephone exchange



(No Model.)

G. E. SHAVER.

MECHANICAL TELEPHONE EXCHANGE.

No. 444,462. Patented Jan. 13,1891.

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UNITED STATES PATENT OEEIcE.

GEORGE FREDERICK SIIAYER, OF NElY YORK, N. .Y., ASSIGNOH TO THE SHAVER OQ)RPORAIION, ()F NE JERSEY.

MECHANICAL-TELEPHONE EXCHANGE.

SPECIFICATION forming part of Letters Patent No. 444,462, dated January13, 1891.

Application filed May 1, 1890. Serial No.350.211. No modehl To all whomit may concern.-

Be it known that I, GEORGE FREDERICK SHAVER, a citizen of the UnitedStates, and a resident of New York, in the county of New York and Stateof New York, have invented certain new and useful Improvements inMechanical-Telephone-Exchange Apparatus, of which the following is aspecification.

The object of my invention is to provide improvements in mechanicaltelephone exchange apparatns,wl1creby better articulation and greaterfacility of operation are attained. The means whereby this end isaccomplished is shown in the accompanying drawings, of which Figure 1shows a side elevation, partly in cross-section. Fig. 2 shows a frontelevation. Fig. 3 shows a front view of a movable hand telephone withparts broken away in order to better show the interior construction.Fig. etis a detail of the switching mechanism, showing an improvedconnecting-hook or vibrator. Fig. 5 shows a detail of the line terminusand supporting device.

Like letters refer to like parts of the different figures.

A represents a piece of steel wire of suiticient size to withstand thetension of the linewire, attached at right angles to the same.

B represents an elastic tube or cushion, preferably made of soft rubberand envelops said wire A.

C represents a loop or link to which the line-wires are attached, andsurrounds the wire A and envelops O and terminates in a hook forengagement with the rigid bar F of the movable hand telephone.

D represents a wire hook for connecting a pair of auxiliaryline-terminals together, the opposite end or shank of the hook beingbent around an elastic support I) and wire a.

E E E represent a series of bars or steps, which are perforated toreceive and support the wires A and the tubes 13 and connectedline-ter1ninals C.

F represents a hook-bar for connecting the line-terminal C O with thediaphragm I of the hand telephone J.

G represents a cone, the base of which is riveted to the diaphragm I andthe apex is soldered to the bar F,which passes through the center of thecone and diaphragm, and the whole being rigidly secured together by anut upon the bar 1 which bears upon the face of the diaphragm l.

.i represents a movable hand telephone, which is provided with the lugK, which engages with the bars E.

ll represents a ring of metal resting against the edges of the diaphragmI. The improved articulation resulting from these improvements are dueto the elastic cushions B l), which allow the vibrations to pass by thesupport A a without changing their character. The articulation isfurther improved by the method of secu ring the bar F to the diaphragmof the hand telephone. The use of the cone fixes the bar rigidly atright angles to the plane of the diapl'iragm, and the base of the cone,by resting upon the diaphragm, prevents over resonance or prolongationof tone, and the resonance is further eliminated by the ring of metal H,which surrounds and rests against the edge of the diaphragm, or maybeplaced over or under it as may be most conveniently manufactured.

The improvement in mounting the hook D upon an elastic tube, instead ofthe manner shown in Fig. 5 of my patent, No. 414,170, issued October 29,1889, permits of freer vibration of the hook and consequent less loss ofpower when transmitting from one line to another. The supporting-bars EE E are placed one a slight distance above and at one side of the other,but overlapping, similar to the construction of a stairway, in order toallow of the removal of any line-terminal with out interfering with therest, and the placing of the terminals in a series of rows enables me tobring a large number of lines into the exchange-frame within a smallspace without crossing or interference one with another. The tension ofthe line-wire is transferred to the diaphragm of the hand telephonebyfirst engaging the bar F with the terminal hook O, and then, pressingdownward upon the telephone-case, the lug K engages with the bar E,which acts as a fulcrum, thus forcing the tele- 2. A terminal supportformechanical-tele-v phone lines, consisting of a wire A and an elasticenvelope B, in combination with supporting-bars E and amechanical-telephone iineterminal, substantially as herein set forth anddescribed.

3. A mechanical telephone line-terminal consisting of a loop or link 0,provided with means for temporary engagement with a movable handtelephone, in combination with a fixed supporting-wire placed at rightangles thereto, and an elastic tube or cushion interposed between saidloop and the supportingwire, substantially as herein set forth anddescribed.

4. In amechanical-telephone-exchange apparatus, the combination of ahook D, provided with an extended shank, said shank being bent into acircular form and inclosing an elastic tube 1), fitted with a Wire orbar a. passing through the center of said tube, substantially as hereinset forth and described.

5. The diaphragm of a movable hand telephone fixed at right angles witha connecting-bar F by means of and in combination with the cone G,substantially as herein set forth.

6. A supporting-frame for mechanical-telephone line-terminals,consisting of a series of parallel bars arranged one above another andat an angle with the perpendicular, in combination with a series ofmechanical-telephone line-supports connecting each pair of barstogether, substantially as herein set forth and described.

Signed at New York, in the county of New York and State of New York,this 30th day of April, A. D. 1890.

GEORGE FREDERICK SHAVER.

Witnesses:

M. CARSON, H. S. TOOTNER.

